The distance from the still water level...

Question 1 / 2707066636ee728f7522a1c5179cd

Question 1 of 2707066636ee728f7522a1c5179cd

The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a MODU is the __________.

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Question 1 of 27070

The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a MODU is the __________.

🔍 Key Concepts

• MODU (Mobile Offshore Drilling Unit) draft and structure relative to the sea surface • Difference between air gap, draft/penetration, and freeboard • Reference level: still water level corrected for tides and storm surge

💭 Think About

• Ask yourself: Is the measurement going upward into the air from the water, or downward into the water from the surface? • Which term is normally used for the distance from waterline to the top of the hull or deck, and which for the distance from waterline to the lowest underwater point? • On a MODU, what term describes how far the hull is below the sea surface, affecting how close the seabed can be?

✅ Before You Answer

• Identify whether the question is talking about the part of the structure above water or below water. • Recall that freeboard is commonly measured from the waterline upwards to a deck or reference point on the hull, not downwards. • Remember that air gap relates to the distance between the underside of the deck/hull and the sea surface, often for wave clearance, not penetration below the water.

Question 1 of 27070

The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a MODU is the __________.

water depth

penetration

freeboard

air gap